irwin



(No Model.)

2 Sheets-Sheet 1. U. H. IRWIN.

DIE FOR MAKING AUGBR BITS.

No. 378,251. Patented Feb. 21, 188-8.-

(No Model.) 2 Sheets-Sheet 2.

' C. H. IRWIN.

DIE FOR MAKING AUGER BITS. No. 378,251. Patented Feb. 21, 1888.

Darren stares ATENT Urrrcn.

CHARLES H. IRNIN, OF WILMINGTON, OHIO, ASSIGNOR TO THE IRWIN AUGER BIT COMPANY, OF SAME PLACE.

DIE FOR MAKlNG AUGER=BITS.

SPECIFICATION forming part of Letters Patent No. 378,251, dated February 21, 1888.

- Application filed Octoher15, 1887. Serial No. 252,415. (No model.)

To all zohon'z, it may concern:

Be it known that 1, CHARLES H. IRWIN, a citizen of the United States, and a resident of lfilniington, Olinton county, and State of Ohio, have invented certain new and useful Improvements in Dies for Making Auger- .3its, of which the following is a specification.

My invention belongs to that class of dies in the art of manufacturing anger-bits known as heading-dies.

The object of these dies is to form the head or cutting-point of the auger-hit. hen the forging has passednnder the operation of these dies, it is complete and ready to he finished up.

These dies :1 re preferably used in making the solid center-stem auger-hit shown and described in Letters Patent No. 306,907, of October 21, 188i, and'Letters Patent No. 361,522, of April 19, 1887.

In the accompanying drawings, forming part of this specification, Figure 1 is a view of the face of the lower die, which receives the forging shown in Fig. 5. Fig. 2 isa view of the face of the upper die used in connection with the die shown in Fig. 1. Fig. 8 is a cross-section of the die shown in Fig. 2, taken at the dotted line a; m. Fig. 4: is a cross-section or the die shown in Fig. 1, taken at the dotted line :0 5 isa view ofthe forging as it appears when it leaves the trip-hammer and forming-dies. Fig. 6 is a view of the forging as it appears when it leaves the dies shown in Figs. 1 and 2. Fig. 7 is a View of the forging as it appears after the surplus metal has been punched off the flat head shown in Fig. 6. Fig. 8 is a view of the face of one of the dies which hold the forging shown in Fig. 7, and Fig. 9 a view of the other dies which hold the said forging. Fig. 10 is a side view of the plunger die or former which is used in connection with the dies shown in Figs. 8 and 9. Fig. 11 is an end view of the plunger die or former. Fig. 12 is an end view of the plunger die or former when used in heading doubletwist auger-hits. Fig. 13 is a view of the finished forgi ng. Fig. 14. is a longitudinal section of the die shown in Fig. 8, (as far as the dotted line shown in Fig. 8;) and Fig. 15 is a longitudinal section of the die shown in Fig. 9,

(as far as the dotted line shown in said Fig. 9.)

When the forging has left the trip-han1mer dies, it appears as shown in Fig. 5, having the head a. This surplus metal in the head a is left to form the cutting and gimlet points, &c., of the bit.

The rough forging shown in Fig. 5 is taken and placed in the dies A and B, part of the solid center stem, a, resting in the die A, and part of the last convolution a resting in the groove 04*, which is out obliquely across the face of the die A. In the die Ais also cutthe long groove of. In the die A are also out the depressions b and I), the depression I) to receive one-half of the metal which forms the wing b and the depression I), which is semicircular inform, to receive all the surplus metal left when the wing b and point 12 are formed.

In the die B is cut the groove b" and the depression b The die B is also cut away at d, so as not to interfere with the part of the convoluted blade of the hit which rests in the de pression a in the die A.

The depression 12* in the die 13 receives onehalf of the metal which forms the point I), and the depression 6 receives one-half of the metal which forms the wing If.

The dies 0 and D have each cutin their faces the grooves d, which receive the solid center stem, a, of the auger-bit. Gut obliquely across the faces of the dies 0 and D are the grooves (P. In these grooves 01 fit the convolutions a of the blade of the bit. here these grooves (1 meet the grooves 01', the grooves are of peculiar shape to properly receive the convoluted blade of the auger-hit. The dies C and D each also have out out at their ends thelarge semicircular groove (Z In the face of the groove d in the die 0 is cut the depression or groove d. This depression (2* is of the peculiar shape of the part (1 of the auger-bit from which the spur and cutting-edges are formed.

E represents .the plunger-die, the point e of which fitsin the space formed by the grooves (1 when the dies 0 and D are brought together. In the face of this plunger-die or former E is cut the deep cone-shaped depression 6. This depression 6 forms the tip e", from which the gimlet-point of the hit is formed. The face of I00 this plunger-die E is cut away at e to assist in forming one of the lips of the part (P.

In the plunger-die shown in Fig. 12, which is used in heading double-twist auger-bits, the face of the plunger-die is also cut away at e.

The dies are used as follows: The forging, as shown in Fig. 5, is taken and the end having the head a placed in the die A, part of the solid center stem, a, resting in the groove a and about one-half of a convolution, a, resting in the recess a, the head a resting in the die A, as shown in Fig. 1 by dotted lines. The die B then descends and the metal in the head a is forced into the grooves a and If, thus forming the point I), and into the depressions b and b forming the wing b and the surplus metal is forced into the semicircular groove 1), forming the flat head a. The forging when it leaves the dies A and B resembles the form shown in Fig. 6. The head of the bit is then placed under a punch and the surplus metal (shown on the forging in Fig. 6) punched off. NVhen the forging leaves the punch, it appears as shown in Fig. 7. The forging, as shown in Fig. 7, is then taken and placed in the dies 0 and D, the solid center stem, a, fitting in the grooves d in said dies, and the convolutions fitting in the grooves d one-half in each die. WVhen these dies are brought together, the two grooves cl form a circular depression. plunger-die is brought down into this depression, and the metal in the wing 12 is forced up into the cavity e, forming the point 6 (from which the gi'mlet-point of the auger-bit is formed,) and forces the metal down into the peculiarly-shaped groove (1, so as to form, in connection with the plunger-die E, the part (1 of the auger bit. From this point d are The formed the spurand cutting-edges of the augerbit. If there remain any surplus metal, it will form a thin crust around the sides of the plunger-die E, and can easily be removed. \Vhen I head double-twist auger-bits, I employ a plunger-die similar to the one shown in Fig. 12. \Vhen desired, the grooves d and d may 5 be oniitted,and one continuous groove in which the auger-bit can rest may be employed, the peculiar depression d, however, being present.

\Vhat I claim as new and of my invention, and desire to secure by Letters Patent, is-

1. In dies for heading auger-bits, the die A, having the grooves a", a, a, and b and the depression I), in combination with the die B, having the grooves b and depression 12 substantially as set forth. 5

2, In dies for heading auger-bits, the dies 0 and D, having the grooves d and d and the large grooves (i the die 0 having the peculiarlyshaped depression (1, in combination with a suitable plunger-die, substantially as set forth.

3. In dies for heading auger-bits, the dies 0 and D, having the grooves d and d and the large grooves (1 the die 0 having'the pecw liarly-shaped depression dflincombination with the plunger-die E, having the cone-shaped 6 cavity 6 and the cut-away portion 6 substantially as set forth.

4. In dies for heading auger-bits, the dies 0 and D, the dies 0 having the peculiarly-shaped groove or depression d, in combination with a suitable plunger-die, as E, substantially as set forth.

CHARLES H. IRWIN. Witnesses:

JNO. W. STREHLI,

PHILIP ROETTINGER, Jr. 

